tst_QToolButton::task176137_autoRepeatOfAction remove setActiveWindow()

2f6fe3a268 as made calls to
QApplicationPrivate::setActiveWindow() redundant.

Remove redundant calls.

Task-number: QTBUG-121488
Change-Id: I233fe1a3dbd3e8ab149f939ebeaaffb5abed4f43
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>

tests/auto/widgets/widgets/qtoolbutton/tst_qtoolbutton.cpp

@@ -182,7 +182,6 @@ void tst_QToolButton::task176137_autoRepeatOfAction()
     label->move(0, 50);
 
     mainWidget.show();
-    QApplicationPrivate::setActiveWindow(&mainWidget);
     QVERIFY(QTest::qWaitForWindowActive(&mainWidget));
 
     QSignalSpy spy(&action,SIGNAL(triggered()));